Printable Hard Sudoku

Set 1uty3k7. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
1 8 5 2
5 9 8
9 4
1
2 6 5 7
3 7 5 8 2
7 8 3 4
9 4
6 7 2 1
Hard #2
9 6 4
4 6 8 7
9 7 8 5
1 3 5 9
8 4 1
5 9 6 4
9 6
6 3
3 1 2
Hard #3
3 6 5 4 9
4 9 7 8
1 4
2 9 3
1 3 2 7
6 5 1
5 2 1 9
7
9 6 3
Hard #4
6 4 1 3
2 7 6
8 4 6
8 3 7
5 1 3 4
9 7 5
5 8 1
3 4
6 8 4 7
Hard #5
4 1
3 8 2 6 4 5
8
3
5 9 4 7
7 6 5 9
5 1 3 7 8
4 7 9 2
4 6
Hard #6
7 1 3
2 5 6 9
9 7 8
7 5
1 6 5 3
6 7 4 9
4 8 2
3 9 1 6
1 5
Hard #7
6 3 8
3 4 7
5 4 9 1
6 9 4 1
3 9 6 5
1 9
9 1 8
5 6 9
7 2 4
Hard #8
6 7
7 9
7 1 9 3 5 8 6
3 5 2
4 1
1 3 8 9
5 6 1
7 5 2
4 9 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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